Inside our bodies, our liver produces urea. Now the question is, what is urea? Urea is a waste product, and a major component of human urine, also known as...yes, pee. And yes, it’s also found in poop. Now the next question is what molecules is this urea made of? They’re made of two ammonia molecules, with one carbon dioxide molecule. Urea also is used a lot as fertilizers in gardens. If you have chickens or other animals, you’re sure to have a lot of urea!